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Yes alpha is positive, because it is a helium nucleus - 2 protons and 2 neutrons, so there is a 2+ charge.
The mass of beta is negligible - it's just an electron.
Gamma does not have mass - it's a wave not a particle. It's an electromagnetic wave.
And what is the masses of alpha beta and gamma
thanks everyone :P
Alpha is 2+ mass 4 (Helium nuclues) and is highly ionising
Beta - is a normal electron and has a negative charge with a mass of 1/2000
Beta + is a positron (anti matter electron) and has the same mass as an electron but the opisite charge
Thanks guys :)